"Vice President Joe Biden joked this week that being able to drive his Corvette is one good reason not to run. But, when asked to give another good reason not to run, Biden responded simply: 'I can't.'"

Biden also told CNN: "For me, the decision to run or not run is going to be determined by me, as to whether I am the best qualified person to focus on the two things I've spent my whole life on: Giving ordinary people a fighting chance to make it, and a sound foreign policy that's based on rational interests of the United States."